Pseudogap formation above the superconducting dome in iron-pnictides
Abstract
The nature of the pseudogap in high transition temperature (high-Tc) superconducting cuprates has been a major issue in condensed matter physics. It is still unclear whether the high-Tc superconductivity can be universally associated with the pseudogap formation. Here we provide direct evidence of the existence of the pseudogap phase via angle-resolved photoemission spectroscopy in another family of high-Tc superconductor, iron-pnictides. Our results reveal a composition dependent pseudogap formation in the multi-band electronic structure of BaFe2(As1-xPx)2. The pseudogap develops well above the magnetostructural transition for low x, persists above the nonmagnetic superconducting dome for optimal x and is destroyed for x ~ 0.6, thus showing a notable similarity with cuprates. In addition, the pseudogap formation is accompanied by inequivalent energy shifts in xz/yz orbitals of iron atoms, indicative of a peculiar iron orbital ordering which breaks the four-fold rotational symmetry.
Keywords
Cite
@article{arxiv.1305.3875,
title = {Pseudogap formation above the superconducting dome in iron-pnictides},
author = {T. Shimojima and T. Sonobe and W. Malaeb and K. Shinada and A. Chainani and S. Shin and T. Yoshida and S. Ideta and A. Fujimori and H. Kumigashira and K Ono and Y. Nakashima and H. Anzai and M. Arita and A. Ino and H. Namatame and M. Taniguchi and M. Nakajima and S. Uchida and Y. Tomioka and T. Ito and K. Kihou and C. H. Lee and A. Iyo and H. Eisaki and K. Ohgushi and S. Kasahara and T. Terashima and H. Ikeda and T. Shibauchi and Y. Matsuda and K. Ishizaka},
journal= {arXiv preprint arXiv:1305.3875},
year = {2014}
}
Comments
14 pages, 10 figures